Anti-pitting abrasion-resistant oil pipe and manufacture thereof

A technology for oil pipe and pitting corrosion, which is used in mechanical equipment, pipeline protection, pipeline damage/wear prevention, etc. Deformation resistance, effect of short processing time

Inactive Publication Date: 2003-09-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high porosity and serious pitting corrosion of the electroless anti-corrosion coating, the service life is not high; the surface layer obtained by vacuum nitriding is brittle and has poor deformation resistance. The nitriding time will reduce the thickness of the corrosion-resistant compound layer, thereby shortening the service life of the pipeline
On the other hand, the pipeline above the oil well has to bear the weight of more than 2,000 meters downhole, that is, more than 200 pipelines, so the downhole pipeline is prone to deformation, resulting in micro-cracks in the nitrided layer, destroying its compactness, and pitting corrosion easily Reduced service life due to perforation
Severe cases may even cause the pipeline to break

Method used

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  • Anti-pitting abrasion-resistant oil pipe and manufacture thereof
  • Anti-pitting abrasion-resistant oil pipe and manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) J55 oil pipe, sand blasting reaches Sa2.5 level;

[0017] 2) Carry out nitrocarburizing with a deep-well gas nitriding furnace, the infiltration agent is ammonia and ethanol, the temperature is 560℃, and the holding time is 5hr, to obtain 15μm carbon-containing iron nitrogen compound;

[0018] 3) Soak the tubing in 20% hydrochloric acid solution for 5 minutes after it comes out of the furnace, and then clean it with distilled water;

[0019] 4) Put it into an electroless nickel plating solution at a temperature of 90℃, the composition of the plating solution is: nickel sulfate 20g / L, sodium hypophosphite: 25g / L, sodium citrate: 25g / L, sodium acetate: 13g / L, Pb 2+ : 1mg / L, sodium lauryl sulfate: 20mg / L, pH value: 5.5, take it out for cleaning after 1hr reaction, the thickness of the coating is 10μm, the nickel content is 93%wt, the phosphorus content is 7%wt;

[0020] Result: The surface hardness is Hv480, the porosity of the coating is 0 measured by the red blood salt-so...

Embodiment 2

[0022] 1) N80 oil pipe, degreasing agent for 30 minutes at room temperature and then rinsed, immersed in 20% hydrochloric acid solution for 15 minutes;

[0023] 2) Carry out nitriding with a deep-well gas nitriding furnace, the infiltration agent is ammonia gas, the temperature is 620℃, and the temperature is kept for 1hr to obtain a 5μm iron nitrogen compound layer;

[0024] 3) After the tubing comes out of the furnace, it is immersed in 20% hydrochloric acid solution for 1 min, and then washed with distilled water;

[0025] 4) Put it into an electroless nickel plating solution at 85℃, the composition of the plating solution is: nickel sulfate 30g / L, sodium hypophosphite: 35g / L, sodium citrate 25g / L, sodium acetate 21g / L, thiourea 2mg / L, sodium dodecyl sulfonate 200mg / L, pH value: 4.5, take it out for cleaning after 2hr reaction, the thickness of the coating is 20μm, the nickel content is 89%wt, the phosphorus content is 11%wt;

[0026] Results: The surface hardness is Hv500, the...

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Abstract

An antiwear oil pipe resisting tubercular corrosion is prepared through pretreating oil pipe, gas-phase nitrifying to form the ferric nitride or carbon-contained ferric nitride on the surface of oil pipe, activating, washing, chemical plating a sacrificial anode type protecting layer, and post-treating. Its advnatages are high surface hardness and high resistance to tubercular corrosion, high temp. compression and deformation.

Description

Technical field [0001] The invention relates to an anti-pitting and wear-resistant oil pipe and a preparation method thereof. Background technique [0002] CO in oilfield pipeline working environment 2 , H 2 S, sulfate-reducing bacteria and other corrosive media, as well as under-scaling corrosion caused by the high degree of water mineralization, the water also contains sand, which causes wear to the pipeline, and bears a certain temperature and pressure. The conditions are harsh, and the wear and corrosion are serious. . Changing the material of the tubing is an effective method, but it is expensive. There are also protective measures such as anode protection and adding inhibitors, but the effect is not ideal. Another method is to perform wear-resistant and anti-corrosion treatments on the tubing. [0003] According to the patent search, in order to prevent oil pipes from corroding, there are invention patents (ZL93100518.3) for “oil pipes with nickel-ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38C23C18/32F16L57/06F16L58/00
Inventor 凌国平
Owner ZHEJIANG UNIV
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